Android HTTPUrlConnection : how to set post data in http body?

Question

I've already created my HTTPUrlConnection :

String postData = "x=val1&y=val2"; URL url = new URL(strURL); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Set-Cookie", sessionCookie); conn.setRequestProperty("Content-Length", "" + Integer.toString(postData.getBytes().length)); // How to add postData as http body? conn.setUseCaches(false); conn.setDoInput(true); conn.setDoOutput(true);

I don't know how to set postData in http body. How to do so? Would I better use HttpPost instead?

Thanks for your help.

@MaximShoustin Can't I simply send it as a String ? I usually do this in iOS : NSString *string = @"x=val1&y=val2"; NSData *postData = [string dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:NO]; [request setHTTPBody:postData]; — Rob
– Rob, Commented Nov 16, 2013 at 16:42

Maxim Shoustin · Accepted Answer · 2015-04-07 08:47:15Z

If you want to send String only try this way:

String str = "some string goes here"; byte[] outputInBytes = str.getBytes("UTF-8"); OutputStream os = conn.getOutputStream(); os.write( outputInBytes ); os.close();

But if you want to send as Json change Content type to:

conn.setRequestProperty("Content-Type","application/json");

and now our str we can write:

String str = "{\"x\": \"val1\",\"y\":\"val2\"}";

Hope it will help,

Complete example here :) guruparang.blogspot.com/2016/01/…

PopulusTremuloides · Accepted Answer · 2018-03-28 02:45:42Z

Guruparan's link in the comment above gives a really nice answer to this question. I highly recommend looking at it. Here is the principle that makes his solution work:

From what I understand, the HttpURLConnection represents the response body as an OutputStream. So you need to call something like:

get the connection's output stream

OutputStream op = conn.getOuputStream();

write the response body

op.write( [/*your string in bit form*/] );

close the output stream

op.close();

and then carry on your merry way with the connection (which you will still need to close).

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